Adding get_anonymous_user_id in Xblock 'user' service.

TNL-836

common/djangoapps/xblock_django/tests/test_user_service.py

@@ -8,7 +8,9 @@ from xblock_django.user_service import (
     ATTR_KEY_USER_ID,
     ATTR_KEY_USERNAME,
 )
+from student.models import anonymous_id_for_user
 from student.tests.factories import UserFactory, AnonymousUserFactory
+from opaque_keys.edx.locations import SlashSeparatedCourseKey
 
 
 class UserServiceTestCase(TestCase):
@@ -55,3 +57,39 @@ class UserServiceTestCase(TestCase):
         xb_user = django_user_service.get_current_user()
         self.assertTrue(xb_user.is_current_user)
         self.assert_xblock_user_matches_django(xb_user, self.user)
+
+    def test_get_anonymous_user_id_returns_none_for_non_staff_users(self):
+        """
+        Tests for anonymous_user_id method to return None if user is Non-Staff.
+        """
+        django_user_service = DjangoXBlockUserService(self.user, user_is_staff=False)
+
+        anonymous_user_id = django_user_service.get_anonymous_user_id(username=self.user.username, course_id='edx/toy/2012_Fall')
+        self.assertIsNone(anonymous_user_id)
+
+    def test_get_anonymous_user_id_returns_none_for_non_existing_users(self):
+        """
+        Tests for anonymous_user_id method to return None username does not exist in system.
+        """
+        django_user_service = DjangoXBlockUserService(self.user, user_is_staff=True)
+
+        anonymous_user_id = django_user_service.get_anonymous_user_id(username="No User", course_id='edx/toy/2012_Fall')
+        self.assertIsNone(anonymous_user_id)
+
+    def test_get_anonymous_user_id_returns_id_for_existing_users(self):
+        """
+        Tests for anonymous_user_id method returns anonymous user id for a user.
+        """
+        anon_user_id = anonymous_id_for_user(
+            user=self.user,
+            course_id=SlashSeparatedCourseKey('edX', 'toy', '2012_Fall'),
+            save=True
+        )
+
+        django_user_service = DjangoXBlockUserService(self.user, user_is_staff=True)
+        anonymous_user_id = django_user_service.get_anonymous_user_id(
+            username=self.user.username,
+            course_id='edX/toy/2012_Fall'
+        )
+
+        self.assertEqual(anonymous_user_id, anon_user_id)

common/djangoapps/xblock_django/user_service.py

@@ -1,7 +1,11 @@
 """
 Support for converting a django user to an XBlock user
 """
+from django.contrib.auth.models import User
+
 from xblock.reference.user_service import XBlockUser, UserService
+from student.models import anonymous_id_for_user, get_user_by_username_or_email
+from opaque_keys.edx.locations import SlashSeparatedCourseKey
 
 ATTR_KEY_IS_AUTHENTICATED = 'edx-platform.is_authenticated'
 ATTR_KEY_USER_ID = 'edx-platform.user_id'
@@ -15,6 +19,7 @@ class DjangoXBlockUserService(UserService):
     def __init__(self, django_user, **kwargs):
         super(DjangoXBlockUserService, self).__init__(**kwargs)
         self._django_user = django_user
+        self._user_is_staff = kwargs.get('user_is_staff', False)
 
     def get_current_user(self):
         """
@@ -22,6 +27,29 @@ class DjangoXBlockUserService(UserService):
         """
         return self._convert_django_user_to_xblock_user(self._django_user)
 
+    def get_anonymous_user_id(self, username, course_id):
+        """
+        Get the anonymous user id for a user.
+
+        Args:
+            username(str): username of a user.
+            course_id(str): course id of particular course.
+
+        Returns:
+            A unique anonymous_user_id for (user, course) pair.
+            None for Non-staff users.
+        """
+        if not self._user_is_staff:
+            return None
+
+        try:
+            user = get_user_by_username_or_email(username_or_email=username)
+        except User.DoesNotExist:
+            return None
+
+        course_id = SlashSeparatedCourseKey.from_deprecated_string(course_id)
+        return anonymous_id_for_user(user=user, course_id=course_id, save=False)
+
     def _convert_django_user_to_xblock_user(self, django_user):
         """
         A function that returns an XBlockUser from the current Django request.user